Finding the Fourth Proportional to 1,164.57, 1,607.10 and 667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,164.57 : 1,607.10 = 667.50 : x
2. Step 2: Convert to fraction form
   1,164.57/1,607.10 = 667.50/x
3. Step 3: Cross multiply
   1,164.57x = 1,607.10 × 667.50
4. Step 4: Simplify right side
   1,164.57x = 1,072,739.25
5. Step 5: Solve for x
   x = 1,072,739.25/1,164.57
6. Step 6: Final answer
   x = 921.15